Ferrari Mailing List: Re: Tire Pressure for Aftermarket Wheels

[LS (lashdeep]

Peter, I currently have a set of "GT" Hoosier radials that are the spec tire 
from last year's Grand Am series. On my mint condition POS, I found that 18-19 
FR and 21-22 RR were best (all cold). 

Specs (Ambient air temp 74 degrees):

Front Engine-RWD
3295 lbs (with half tank)
Dist- 55% FR- 45% RR
265rwhp
3.23 Final Drive
18"-245mm FR tire width
18"-305mm RR tire width

-1/8" Toe FR
-3.4 degrees camber FR
-0.5 degrees RR
0 toe RR

I found the Hoosiers to love lots of neg camber and low pressures. I started 
with 27 all around and lower I went up front, the more neutral I could get the 
balance. Finally, at 18 cold, my pants were around my ankles...mission 
accomplished. The resident STIG at the track claimed that my car was one of the 
best handling of its type he had driven. I took that as a compliment since was 
a professional racer and...I built the car myself! :)

LS



----- Original Message ----
From: Peter Pless <ferrarilist [at] pless.com.au>
To: LS <lashdeep [at] yahoo.com>
Cc: The FerrariList <ferrari [at] ferrarilist.com>
Sent: Wednesday, November 7, 2007 7:45:01 PM
Subject: Re: [Ferrari] Tire Pressure for Aftermarket Wheels

What hot pressures do you run with the hoosiers?  I'm assuming you're using
the current SPORTS CAR D.O.T. - RADIALS



-----Original Message-----
From: LS [mailto:lashdeep [at] yahoo.com] 
Sent: Thursday, 8 November 2007 11:38 AM
To: Peter Pless
Cc: The FerrariList
Subject: Re: [Ferrari] Tire Pressure for Aftermarket Wheels

Who checks their tires weekly? 

I'm asking because a car that I haven't driven in a week and a half has a
flat...it's on an R Compound Hoosier that is so stiff, it doesn't even look
down, yet it shows 9psi on a tire gauge.

BTW-Handles pretty good with 9psi. The Hoosiers heat up evenly with 18-20psi
(FR) on my 3295 lbs curb weight, 55%FR/45%RR, RWD, V8 car.

Toyo RA1s are good with 22-24 psi on my 2850lbs curb weight, 54%FR/46%RR,
RWD, V8 car.

And, I hope nobody out there is aligning their Ferrari with less than
factory specified (and thus performance oriented) specs. Buy a Honda
minivan, like I did, if you're worried about tire wear!

LS 

----- Original Message ----
From: Jeff Greenfield <coyote [at] acme-ltd.com>
To: LS <lashdeep [at] yahoo.com>
Cc: The FerrariList <ferrari [at] ferrarilist.com>
Sent: Wednesday, November 7, 2007 6:17:39 PM
Subject: Re: [Ferrari] Tire Pressure for Aftermarket Wheels

In addition to what Dennis wrote below, after you find pressures that feel
good, check the tires for uneven wear after a few thousand miles.

Most modern RWD cars with fat tires will tend to wear the rear tires more in
the middle, and the fronts on the outside edges.

If you want to maximize tire life, you may need to find a compromise between
what feels good, and what works for wear.

Jwff

Sent from my iPhone

On Nov 7, 2007, at 12:55 PM, Dennis Liu <bigheaddennis [at] gmail.com> wrote:

> IMHO, while this is a great technique for track use, it's not that 
> helpful for STREET use.
>
> It's like dressing for a January day.  Do you wear the winter parka,   
> or just
> the light windbreaker?  Depends on whether you're going to watch a 
> football game or going for a 5 mile run.
>
> Tire pressure for track use is different from tire pressure for street 
> use.
> If your suspension is set up for aggressive track use (e.g., plenty of 
> negative camber), you'll never achieve even tire temps across the 
> treadwidth unless you are SERIOUSLY HAMMERING IT on the street (beyond 
> the point of sanity).  The only way to get uniform tire temps in that 
> circumstance would be to lower the pressure so much you'll suffer 
> major handling issues.
>
> Conversely, if you've got your suspension set for street/comfort use, 
> if you
> do some hard cornering with it, you'll end up with uneven tire temps   
> (hot
> outside, cooler inside) that you won't be able to correct for using 
> pressure unless you crank up the pressures way too high.
>
> Bottom line, it's actually not that hard - just start with a set 
> pressure, drive, and see how the car feels (given your standard 
> driving conditions).
> Adjust up and down, and be happy with whatever you like the most.
>
> It's not rocket science, folks.
>
> P.S. for Chuckles, living in the land of long straight roads 
> punctuated by periodic stop signs and 90 degree turns, he really 
> should consider setting the car up so that he's not blowing through 
> new sets of tires every 5k miles.
>
> vty,
>
> --Dennis
>
> -----Original Message-----
> From: LS [mailto:lashdeep [at] yahoo.com]
> Sent: Wednesday, November 07, 2007 12:40 PM
> To: Dennis Liu
> Cc: The FerrariList
> Subject: Re: [Ferrari] Tire Pressure for Aftermarket Wheels
>
> Go on a hard, curvy drive and have someone with a pyrometer check 
> temps across the tread...when they are withing 5 degrees from inside 
> to outside, you have the right temp.
>
> LS
>
> ----- Original Message ----
> From: Charles Perry <charles [at] carolina-sound.com>
> To: LS <lashdeep [at] yahoo.com>
> Cc: The FerrariList <ferrari [at] ferrarilist.com>
> Sent: Sunday, November 4, 2007 9:09:06 AM
> Subject: [Ferrari] Tire Pressure for Aftermarket Wheels
>
> What is the list's opinion on picking a tire pressure for aftermarket 
> wheels where the wheel differs signficantly from stock?
>
> I ask because of my TR. It had the metric wheels when I bought it, so 
> I bought a set of 18" HRE wheels from Karl early on. They are 
> obviously very different from the stock wheels in both sidewall height 
> and
> construction, so I always picked the tire pressure by looking at the   
> max
> rating on the tire and backing it down some (like if the tire said 51 
> psi max, I would run them around 44-46. This is very unscientific. I 
> haven't seen uneven tire wear, so by that measure I assume it was OK.
>
> Is there a way to calculate the best tire pressure? Should I pick the 
> factory recommendation from the 512TR since its wheels are nearly 
> identical to my current ones in terms of size?
>
> I did Google the subject but only seem to get car-specific wheel 
> recommendations.
>
> -- charles
>
>
>
>
> --------------------------------------------------------------------
>                          Charles G. Perry IV
>
> Carolina Sound Communications          (843) 571-4488
> 1941 Savage Rd., Suite 200G            (843) 571-4492 fax
> Charleston, SC 29407                    www.carolina-sound.com
>
>
>      "The problem with doing things right the first time is that no
>
>            one realizes how difficult it was."
>
> ---------------------------------------------------------------------
>
> _________________________________________________________________
> To unsubscribe or modify your subscription options, please visit:
> http://lists.ferrarilist.com/mailman/options/ferrari/lashdeep%40yahoo.
> com
>
> Sponsored by BidNip.com eBay Auction Sniper http://www.BidNip.com/ and 
> F1 Headlines http://www.F1Headlines.com/
>
> __________________________________________________
> Do You Yahoo!?
> Tired of spam?  Yahoo! Mail has the best spam protection around 
> http://mail.yahoo.com 
> _________________________________________________________________
> To unsubscribe or modify your subscription options, please visit:
> http://lists.ferrarilist.com/mailman/options/ferrari/bigheaddennis%40g
> mail.c
> om
>
> Sponsored by BidNip.com eBay Auction Sniper http://www.BidNip.com/ and 
> F1 Headlines http://www.F1Headlines.com/
>
> _________________________________________________________________
> To unsubscribe or modify your subscription options, please visit:
> http://lists.ferrarilist.com/mailman/options/ferrari/coyote%40acme-ltd
> .com
>
> Sponsored by BidNip.com eBay Auction Sniper http://www.BidNip.com/ and 
> F1 Headlines http://www.F1Headlines.com/
>
_________________________________________________________________
To unsubscribe or modify your subscription options, please visit:
http://lists.ferrarilist.com/mailman/options/ferrari/lashdeep%40yahoo.com

Sponsored by BidNip.com eBay Auction Sniper http://www.BidNip.com/ and F1
Headlines http://www.F1Headlines.com/

__________________________________________________
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around
http://mail.yahoo.com
_________________________________________________________________
To unsubscribe or modify your subscription options, please visit:
http://lists.ferrarilist.com/mailman/options/ferrari/ferrarilist%40pless.com
.au

Sponsored by BidNip.com eBay Auction Sniper http://www.BidNip.com/ and F1
Headlines http://www.F1Headlines.com/

No virus found in this incoming message.
Checked by AVG Free Edition. 
Version: 7.5.503 / Virus Database: 269.15.24/1115 - Release Date: 7/11/2007
9:21 AM


_________________________________________________________________
To unsubscribe or modify your subscription options, please visit:
http://lists.ferrarilist.com/mailman/options/ferrari/lashdeep%40yahoo.com

Sponsored by BidNip.com eBay Auction Sniper
http://www.BidNip.com/
and F1 Headlines
http://www.F1Headlines.com/

__________________________________________________
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 
http://mail.yahoo.com